mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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17903bcdb6
* Revert "Move global metric back to `otel/metric/global` for minor release (#3986)"
This reverts commit 8dba38e02f.
* Add changes to changelog
* Fix versions and go mod tidy
* Run go-mod-tidy
101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric_test
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import (
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"context"
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"fmt"
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"runtime"
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"time"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/metric"
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)
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func ExampleMeter_synchronous() {
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// Create a histogram using the global MeterProvider.
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workDuration, err := otel.Meter("go.opentelemetry.io/otel/metric#SyncExample").Int64Histogram(
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"workDuration",
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metric.WithUnit("ms"))
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if err != nil {
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fmt.Println("Failed to register instrument")
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panic(err)
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}
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startTime := time.Now()
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ctx := context.Background()
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// Do work
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// ...
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workDuration.Record(ctx, time.Since(startTime).Milliseconds())
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}
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func ExampleMeter_asynchronous_single() {
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meter := otel.Meter("go.opentelemetry.io/otel/metric#AsyncExample")
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_, err := meter.Int64ObservableGauge(
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"DiskUsage",
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metric.WithUnit("By"),
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metric.WithInt64Callback(func(_ context.Context, obsrv metric.Int64Observer) error {
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// Do the real work here to get the real disk usage. For example,
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//
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// usage, err := GetDiskUsage(diskID)
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// if err != nil {
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// if retryable(err) {
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// // Retry the usage measurement.
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// } else {
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// return err
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// }
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// }
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//
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// For demonstration purpose, a static value is used here.
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usage := 75000
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obsrv.Observe(int64(usage), metric.WithAttributes(attribute.Int("disk.id", 3)))
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return nil
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}),
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)
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if err != nil {
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fmt.Println("failed to register instrument")
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panic(err)
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}
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}
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func ExampleMeter_asynchronous_multiple() {
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meter := otel.Meter("go.opentelemetry.io/otel/metric#MultiAsyncExample")
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// This is just a sample of memory stats to record from the Memstats
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heapAlloc, _ := meter.Int64ObservableUpDownCounter("heapAllocs")
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gcCount, _ := meter.Int64ObservableCounter("gcCount")
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_, err := meter.RegisterCallback(
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func(_ context.Context, o metric.Observer) error {
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memStats := &runtime.MemStats{}
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// This call does work
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runtime.ReadMemStats(memStats)
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o.ObserveInt64(heapAlloc, int64(memStats.HeapAlloc))
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o.ObserveInt64(gcCount, int64(memStats.NumGC))
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return nil
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},
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heapAlloc,
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gcCount,
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)
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if err != nil {
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fmt.Println("Failed to register callback")
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panic(err)
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}
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}
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